BOINC

http://boinc.berkeley.edu/
The Berkeley Open Infrastructure for Network Computing (BOINC) is
a software platform for distributed computing: several
initiatives of various scientific disciplines all compete for the
idle time of desktop computers. The developers' web site at the
University of Berkeley serves as a common portal to the otherwise
independently run projects.

This package depends both on the BOINC core client program that
is required to participate in any project that uses BOINC, and
the BOINC Manager, a graphical monitor and control utility for
the BOINC core client.

There are free software science apps that use BOINC located at SETI@home.

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